Saw-hanging device for gang-saws



(No Model.)

W. M. WILKIN.

SAW HANGING DEVICE FOR GANG SAWS.

No. 389,126. Patented Sept. 4, 1888.

)Kinesses. W QJi. G v F12 UNITED STATES PATENT QEEIcE.

\VILLIAM Ill. \VILKIN, OF ERIE, PENNSYLVANIA.

SAW-HANGING DEVICE FOR GANG-SAWS.

SPECIFICATION forming part of Letters Patent No. 389.126, dated September 4, 1888.

Application filed March 24, 1887. Renewed March 8,1888. Serial No. 266.531.

To all whom it may concern.-

Be it known that I, \VILLIAM M. WILKIN, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Saw-Hanging Devices for GangSaws; and I dohereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to devices for hanging saws in gang-saw frames; and it consists in certain improvements in the construction thereof, as will be hereinafter fully set forth, and pointed out in the claims.

My device is illustrated in the accompanying drawings, in which-- Figure 1 is a perspective view of a fragment of a gangsaw frame, a saw, and the hanging devices. Fig. 2 is a side view of one of the saw-buckles. Fig. 3 is a transverse section of one of the buckles on the line at a: in Fig. 2. Fig. 4 is a side elevation of one of the lower buckles with the lower girt, AF, in crosssection.

A marks the upright part of the saw-frame; A, the upper girt of the frame; A the lower girt; B, the upper saw-buckle; B, the lower saw-bnckle, and O the saw.

The first part of my invention relates to the construction of the tabs on the saws and that part of the buckles which receives the tabs; and the second partof my invention relates to the construction of the lower girt of the frame and that part ofihe lower buckle which engages with the lower girt.

The object of my invention is to cheapen and improve the construction of these parts. Heretofore the tabs on the ends of the saws have been made of flat pieces of metal and the inner edges have been beveled toward the saw, giving a dovetail or hook form, and the slots in the buckles which receive the tabs have been made to correspond with the form of the tabs. This necessitated very exact work in the construction of these parts, as the bearing of the tabs on the buckle must be the same on each side of the saw or the strain would be unequal, which would prevent the saw drawing straight. To get these parts perfect required (No model.)

much care and skill and was expensive. To avoid these difficulties I make the tabs 0 on the saw 0 round, as seen in Fig. 1, and the opening I) in the buckles to receive these tabs are round with a slot, b, to receive the sawplatc, which is slightly larger than the saw is thick. This construction of the buckle is clearly shown in Fig. 3. I make the walls of the slot 1) slightly flaring outwardly. The most proper construction, perhaps, is to make the walls of the slot 1) radial from the eye I). This construction is very cheap, rcquiringlit tle skill or care to make the work exact, for the eye is made by simply drilling a hole through the buckle, and the slot may be opened by a milling tool or a slotting-tool, and no further work is required. It will-be seen that when the saw is under strain the buckle will adjust itself 'to the tab, so as to bear equally on each side of the saw.

Heretofore the lower girt has been made with rectangular ribs on the sides, to engage which the lower saw-buckle and these ribs were beveled in on the lower edge, so as to give a hooked or dovetail form, similar to the tabs on the saw, and the lower part of the lower buckles was formed to engage these ribs like a grapple. This construction required perfect workmanship in finishing, and it also was necessary to form a joint between that part of the lower buckle which engages the lower girt and that part which engages with the saw, in order to get perfect adjustment when the parts were under strain. I obviate these difficulties and the necessity of said joint by making the ribs a on the sides of the lower girt round,working them both from a common center, as seen clearly in Fig. 4, and the lower part of the lower buckle, B, I make with a round opensided eye, B", which is at right an gles to the eye b.

By observing Fig. 1 it will beseenthat when the saw 0 is under strain the lower buckle will adjust itself both to the saw-tab c and to the girt-rib a (6, so as not to interfere with the direct vertical tension of the saw. This con struction of the lower buckle is much cheaper than the old construction, and is stronger and better in every way.

What I claim as new is- 1. In a saw-hanging device for gangsaws,

IO open-sided eye, Z), to receive the saw, and a round open-sided eye, B at right angles to the eye b, to engage the girt of thc saw-frame, of a round tab, 0, on the saw, and round ribs a a, 0n the saw-girt, substantially as set forth.

In testimony whereof I affix my signature in 15 presence of two witnesses.

WILLIAM M. WILKIN. \Vitnesses:

R0131. I-I. PORTER, F. B. XVIIIPPLE. 

